package com.gitee.techstack.log;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import java.io.ByteArrayOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

public class RSAEncrypt {
    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥

    public static Cipher cipher = null;
    public static void main(String[] args) throws Exception {
        //生成公钥和私钥
        genKeyPair();
        //加密字符串
//        String message = "df723820";
        System.out.println("随机生成的公钥为:" + keyMap.get(0));
        System.out.println("随机生成的私钥为:" + keyMap.get(1));
        for(int i=0;i<100;i++){
            new Thread(() -> {
                String message = "df723820";
                try {
                    message = encrypt(message,"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmIPIbYaT0QToYe4hPrrUA4dyYt57Jxyh/DImQXLqkzJDC0Zw/4iIGPB+i87skpGfy4XTcBxytPdPHgVBAEgk4EE9RHN6DKM0ufCQqOpKSxHWnSk+Lt9T1r0sIkf/mJ28WYG2GEOV0XMV0OqQT09VDC9XKJpjNeE5HvKWMs/k7lfxj1tRMPrDBcv1eBUcxwJ5+Hkpt8fYKYud5AuCRTnmXJOAPsJRhKHLEytlc7o7ri3PxFwk/6hvcAzz3feQ7IccM2g+46FvnouhWuKPtbM7MSjMYJZbhamDuV9IrLwm6/bB+POBNgzeBe4vG3N/gv9kr98209Z0eKe61bKuZC9cIQIDAQAB");
                } catch (Exception e) {
                    e.printStackTrace();
                }
                System.out.println(message + "\t加密后的字符串为:" + message);
                String messageDe = null;
                try {
                    messageDe = decrypt(message,"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");
                } catch (Exception e) {
                    e.printStackTrace();
                }
                System.out.println("还原后的字符串为:" + messageDe);
            }).start();
        }
        System.in.read();
    }

    /**
     * 随机生成密钥对
     * @throws NoSuchAlgorithmException
     */
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(2048,new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
        // 得到私钥字符串
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
        // 将公钥和私钥保存到Map
        keyMap.put(0,publicKeyString);  //0表示公钥
        keyMap.put(1,privateKeyString);  //1表示私钥
    }
    /**
     * RSA公钥加密
     *
     * @param str
     *            加密字符串
     * @param publicKey
     *            公钥
     * @return 密文
     * @throws Exception
     *             加密过程中的异常信息
     */
    public static String encrypt( String str, String publicKey ) throws Exception{
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
//        Cipher cipher = Cipher.getInstance("RSA");
        cipher = getCipher();
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    /**
     * RSA私钥解密
     *
     * @param str
     *            加密字符串
     * @param privateKey
     *            私钥
     * @return 铭文
     * @throws Exception
     *             解密过程中的异常信息
     */
    public static String decrypt(String str, String privateKey) throws Exception{
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA解密
//        Cipher cipher = Cipher.getInstance("RSA");
        cipher = getCipher();
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }

    public static synchronized Cipher getCipher()
            throws NoSuchAlgorithmException, NoSuchPaddingException {
        if (cipher == null) {
            cipher = Cipher.getInstance("RSA");
        }
        return cipher;
    }
}
